嵌入式碳纤维板加固木梁抗弯性能的试验研究

Experimental study on bending behaviors of timber beams strengthened with near-surface mounted CFRP sheets

为了研究嵌入式碳纤维板加固矩形木梁的破坏形式、抗弯承载力和截面应变分布,对不同尺寸的12种嵌入式碳纤维板加固矩形木梁试件的抗弯性能进行了试验研究,试件包括4根未加固梁和8根嵌入式碳纤维板加固梁,松木和杉木各占一半.试验结果表明,与未加固试件相比,木梁经嵌入式碳纤维板加固后,抗弯承载力明显提高.松木试件和杉木试件的抗弯承载力提高幅度分别为9.1%～35.1%和19.8%～37.4%.木梁截面应变沿梁截面高度方向的分布基本符合平截面假定.最后,基于理论公式的推导和试验数据的修正,提出了嵌入式碳纤维板加固松木和杉木矩形木梁抗弯承载力的计算公式.

In order to study the bending behaviors,including the failure mode,bending bearing capacity and strain distribution at mid-span section,of timber rectangle beams strengthened with near-surface mounted carbon fiber reinforced polymer（CFRP） sheets,the bending tests on 12 specimens with different sizes were carried out.The specimens include 4 unstrengthened specimens and 8 specimens strengthened with near-surface mounted CFRP sheets.The number of specimens made by deal and fir is half to half.The experimental results show that compared with the unstrengthened specimens,the bending bearing capacity of the specimens strengthened with near-surface mounted CFRP sheets are obviously improved.The bending bearing capacities of the deal specimens and the fir specimens are improved by 9.1%-35.1% and 19.8%-37.4%,respectively.The distribution of section strain along the height of timber beam basically obeys the plane hypothesis.Based on the theoretical analysis and experimental results,the computing formulas of the bending bearing capacity of deal and fir rectangle beams strengthened with near-surface mounted CFRP sheets are presented.